Method of making reenforced receptacles



M. R. HARRISON. METHOD OF MAKING REENFORCED RECEPTACLES.

APPLICATION FILED APR. 5,1920.

Patented June 6, 1922.

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I 'MA 0 MARY R. HARRISON, OT? BOSTON, MASSAOHUEGETIS, AfiSIGNGR TO EI DVIARD H. ANGIER,

OF FRAJS'LI-NGTOH, ldASSAC'HUSETTS' AppIication filed April 5, 1920. I

. 1,7051; my Vern:

Be it known that I, MARY R. HARRISON, a citizen of the United States, and resident of Boston, in the county of Suffolk and State of ldassachusetts, have invented certain new and useful Improvements in Methods of h laking Reinforced Receptacles, of which the following is a specification.

This application is a continuation of my application filed October 2, 1916, Serial No. 123,255, so far as relates to subject matter common to both.

This invention relates to sheet material for enclosing heavy or bulky articles, and the chief object is to provide material for this purpose which is economical to produce and is effective for many uses especially the manufacture of strong envelopes.

To make strong envelopes or bundle-wrapping sheets, it has long been customary to adhesively unite paper and cloth the latter being more or less closely Woven according to the particular uses to which the sheet material is to be put. Owing tothe comparative cost of cloth suitable for the purpose, attempts have been made to make envelopes of reinforced paper consisting of two sheets of paper with intervening strands of cord or twine, the two sheets being adhesively united. Such attempts have been unsuccessful for several reasons one of which is that the twine, to possess suflicient strength, must be of such size that the blan s can not be successfully died out and then creased and folded in an envelope-making machine, and twine of that size would result in the pres "ence of such ridges on the surface which would have to be used when addressing the envelope that clear addressing is difficult if not impossible.

In, carrying out my invention, I preferably employ a single thickness of paper having thin flat unwoven tapes adhesively. secured to that surface of the paper which is to be the inside when the envelope or other container is completed. 'I emphasize envelopes because my improved sheet material is particularly well qualified for the manufacture of an effective economical substitute for the present expensive cloth-lined envelopes.

Of the accompanying drawings:

Fig. 1 represents a sheet of the material, said figure also indicating how ordinary envelope blanks may be economically out therefrom.

Specification of Letters Patent. Patent-red J g 13 1922 Serial No. 371,331.

.Fi 2 represents an envelope blank creased and ready to be folded.

Fig. 3 represents a section on line 33 of Fig. 1, on an enlarged scale.

Fig. 4-. represents a complete envelope ready to receive an enclosure.

The paper a may be of any kind. The reinforcing strands b are preferably made of thin, flat, 'unwoven tapes, such as narrow strips of Kraft paper, gummed on one surface, or that which is known as wrapping tape, consisting of a plurality of fine threads or fibers which are stuck together side by side. This materialis sometimes known as, advertising tape because merchants use it for tying up packages, the tape bearing the name and address of the merchant, and sometimesother printed matter. It is obtainable in various colors. I prefer plain white for white paper, but'what some might call artistic effects could be obtained by employing a variety of colors.

By the employment of a machine such as that in my Patent 1,195,951, granted Aug. 22, 1916, that is, by the employment of so much of such machine-as feeds a web of paper the direction of its length and applies parallel longitudinal strands thereto,

I produce such material as shown in Figure 1 of the present drawing. I find that by moistening the paper, no adhesive other than what is carried by the tape itself as the latter is manufactured, is necessary. Or

the paper a while on its way through the machine, may have stripes of an adhesive applied thereto and the flat tapes simply be guided onto those stripes and the whole subjected to pressure. The tapes are parallel with each other and with the edges of the paper web and are simply stuck to the paper. By employing such material I obtain great strength by width instead of thickness, and

cause no such ridges as result from using or-' dinary twine or string having substantially thesam'e strength. The width of the strands b is such as to confine between them and the paper all the adhesive that is necessary to firmly and permanently connect them. Ordinary thread or string, which is of course round in cross section, can not confine enough adhesive to do this. And this flat tape material can be die-cut, and can be folded or bended around corners, more readily than round string or twine, and is not so liable to be engaged by other objects or articles,

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and separated from the paper. In other words it clings much more closely to the paper than ordinary string or twine, and the entire sheet material is thinner or fiatter, and the smoothness of the address-receiving surface of the paper is but slightly interrupted.

By cutting blanks from the material as indicated in Figure 1, so that the stays 5 cross all four fold creases substantially at an angle of degrees as shown in Figure 2, and then folding in the usual way, an envelope such as shown in Figure at 1s produced. i

It will now be understood that the sheet material as described is cheaper and of less weight than that now used for making the ordinary cloth-lined envelope. The economy is due not only to the smaller quantity of textile material, and dispensing with any weaving operation, but'also to the use of much less adhesive since there must be a. film of adhesive over the entire surface when cloth is employed. It is also cheaper and of less weight than reenforced paper consisting of triple-thick material (two of paper and an intervening layer of glue) and strings.

Ordinary twine or string can not be used in the manner in which I employ the flat tape because if fine it is impossible to locate enough glue between it and the paper to hold it in place, and if large enough to accommodate more glue it interferes with creasing and folding and addressing. By employing flat strands, they can be very thin and still have enough glue between them and the paper to secure them firmly.

Instead of employing previously made unwoven tape of the kind described, I may form such tape on the paper why so guiding a plurality of line threads thatthey will be laid on the paper in groups, with an adhesivesecuring said fine threads together and to the paper.

Most paper is so made that its tensile strength is greatest in the direction of the length of the web. In other words its grain as it is called is lengthwise of the web. lVhen I employ paper for the stays or strands b, I preferably first coat a web of strong-grained paper with an adhesive and after the latter is dry.

then cut it into long narrow strips (say g, inch wide) and coil said strips, after which the strips may be applied to the paper a in the same manner as hereinbefore described, preferably moistening only the adhesive-coated surfaces of the strips 6. 7

Of course the advertising tape referred to has its grain in the direction of its length, and the same is true of paper strips or strands such as just described. Therefore, when the strands are arranged as shownin Figures 2 and 4, each fold crease of an en--- velope is crossed by strands the grain of which is longitudinal, and therefore best capable of reinforcing the folds of articles made from reenforced sheets of the kind described, and illustrated in Figure 1.

I do not limit myself to the manufacture of the kind of articles usually understood as envelopes, as my inventionis applicable to other receptacles such aspaper bags or boxes. i

I also do not limit myself to combining the thin fiat strands with previously made paper as they may be introduced in a web of pulp during the manufacture of paper in an ordinary paper-making machine, as explained in Letters Patent No. 1,325,091, granted to me December 16, 1919, from which paper so made and reenforced the blanks such as described will be out.

Having 'now described my invention, I claim:

1. The method of making reenforced paper for folded receptacles, consisting in securing to a web of paper a plurality of separate spaced flat textile strands, and cutting blanks from said web in a manner to cause the strands to cross the blanks at an acute angle to thelines required for folding the blanks to receptacle form.

2. The method of producing blanks for making folded paper receptacles, consisting in securing to a web of paper a plurality of spaced reinforcing textile strands, and then cutting blanks therefrom at an angle of substantially 45 to said strands.

3. The method of producing blanks for making folded paper receptacles, consisting in securing to a web of paper a plurality of spaced groups of line threads, each group having its threads close together, and then cutting blanks from said web at an angle of substantially 15 to the groups of threads. In testimony whereof I have afiixed my signature.

MARY 1e. naenrsou.

Certificate of Correction.

v It is hereby certified that in Letters Patent No. 1,419,048, granted June 6, 1922, upon the application of Mary R. Harrison, of Boston, Massachusetts, for an improvement in Methods of Making Reenforced Receptacles, an error appears requiring correction as follows: In the printed specification the residence of the assignee is erroneously given as Framington, Massachusetts, Whereas said residence should have been given as Framingham, fl [assach-usetts, as shown by the records of assignments in this office; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Oflice.

Signed and sealed this 11th day of July, A. D., 1922.

[SEAL] KARL FENNING,

' Acting Commissioner of Patents. 

